After the effective date of this act, a vacancy shall be deemed to exist in the office of a chief deputy or a full-time deputy coroner six months after appointment unless such person has completed the course of instruction provided for in section 2(d) or unless, for just cause, the board postpones his completion of the course. This section shall not apply to those chief deputies or full-time deputy coroners who are covered bysection 3(a) .
16 P.S. § 9525.4